<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			#box{
				width: 300px;
				height: 200px;
				border: 3px solid red;
				display: flex;
				align-items: baseline; 
			}
			#box div{
				width: 60px;
				height: 50px;
				text-align: center;
				border: 1px solid blue;
			}
		</style>
	</head>
	<body>
		<div id="box">
			<div>div1</div>
			<div>我是div2，我的高度最高</div>
			<div <!--style="height: 70px; line-height: 70px;"-->>我是div3</div>
		</div>
	</body>
</html>
